ABB SPAC 531 C User Manual And Technical Description page 33

Example 3. Feeder terminal SPAC 531 C1 used for the
protection of an outgoing feeder in a one-breaker
system. The earth-fault protection has a signal-
ling function only.
In this application (Fig. 11) the earth-fault
protection has a signalling function only. In
such a case the auto-reclose functions can be
started in the normal way also by the directional
earth-fault relay module. The starting time (e.g.
parameters S25 and S35) of the auto-reclose
unit should be 200 ms + CB operate time t
shorter than the time delay preceding final trip-
ping. At the end of the auto-reclose sequence a
signal for earth fault is received and the start of
another auto-reclose sequence is prevented.
Switch SGB/SPCJ 3C3
1 1 I> start to AR2
2 0 no I>> start to AR2
3 1 I>> start to AR1
4 0 no block. BS 1 to t>
5 0 no block. BS 1 to t>> 0 no block. BS 1 to t>>
6 0 no block. BS 2 to t>
7 0 no block. BS 2 to t>> 0 no block. BS 2 to t>> 0 no TRIP sign. to
8 0 not in use
With the Iϕ>> setting ∞, infinite, and above
SGB and SGR switch settings the output con-
Contact Function
X1/3-4 Opening 1 of CB (I>, I>>)
X1/6-7 Signal for final trip (I> or I>>)
X2/1-2-3 Iϕ> alarm signal
X2/4-5-6 I>> start and blocking signal to phase overcurrent modules of incoming
feeder cubicle
X2/7-8-9 Iϕ> start
X1/8-9-10 Self-supervision alarm (IRF)
X3/11-12 Opening 2 of CB (local control, remote control, AR)
X3/13-14 CB closing
The AR parameters can be set as shown in example 1.
The start of low-set stage of the directional
earth-fault relay module produces a signal over
the contact X2/7-8-9. After the operate time t>
an alarm signal is received over the contact X2/
1-2-3. In such a case the SGR/3 switch of the
I/O module must be in position 0. Selection of
the starting value ∞, infinite, sets the high-set
stage of the directional earth-fault relay module
totally out of operation.
The switches on the PC boards of the relay
modules have to be set as follows:
cb
SGB/SPCS 3C4
1 Iϕ> start to AR3
0 no Iϕ>> start to AR3 1 I> and I>> trip to
0 no Iϕ>> start to AR1 0 no Iϕ> trip to TRIP
0 no block. BS 1 to t>
0 no block. BS 2 to t>
0 not in use
tacts of feeder terminal SPAC 531 C1 have the
following functions:
SGR
0 no I> start to SIGNAL 3
SIGNAL 1
output
0 not in use
0 not in use
0 not in use
SIGNAL 1
0 no TRIP sign. to
SIGNAL 2
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